Keyphrases
- natural language
- parse tree
- penn treebank
- syntactic structures
- syntactic analysis
- linguistic analysis
- phrase structure
- highly ambiguous
- dependency structure
- tree bank
- syntactic categories
- natural language processing
- natural language sentences
- probabilistic context free grammars
- semantic parsing
- noisy environments
- dependency tree
- semantic analysis
- syntactic parsing
- sentence compression
- link grammar
- dependency parsing
- document summarization
- sentence level
- multi document summarization
- text summarization
- word sense disambiguation
- missing data
- unsupervised learning
- information extraction
- training data
- knowledge base